CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)
Net sales	$ 5,423	$ 6,561	$ 16,584	$ 21,190
Cost of goods sold	2,499	3,041	7,684	8,995
Gross margin	2,924	3,520	8,900	12,195
Operating expenses:
Research and development	1,544	1,577	4,539	4,922
Selling, general and administrative	1,705	2,006	6,112	7,003
Total operating expenses	3,249	3,583	10,651	11,925
Operating income (loss)	(325)	(63)	(1,751)	270
Non-operating income (loss):
Interest income	71	41	224	125
Foreign currency transaction gain (loss)	(53)	(15)	9	107
Total non-operating income (loss)	18	26	233	232
Income (loss) before income taxes	(307)	(37)	(1,518)	502
Income tax (expense) benefit	0	(16)	(393)	(160)
Net income (loss)	$ (307)	$ (53)	$ (1,911)	$ 342
Basic earnings (loss) per share	$ (0.03)	$ (0.01)	$ (0.21)	$ 0.04
Diluted earnings (loss) per share	$ (0.03)	$ (0.01)	$ (0.21)	$ 0.04
Weighted-average basic shares	9,235	9,020	9,121	8,914
Weighted-average diluted shares	9,235	9,020	9,121	9,065